Furnace construction



F. H. WAlTE ET AL.

FURNACE CONSTRUCTION Filed Nov. 2'?, 1925 A TTORNE Y.

Nov. l 1927.

1 647,161 Nov l 1927' F. H. wArrE E'r Al.

FURNACE CONSTRUCTION Filed Nov. 27. 1925 3 Sheets-Sheet2 Nov. 1, 1927.

F. H. WAITE ET Al.`

FURNACE coNs'rRuoTwN Filed Nov. 27, 1925 3 Sheets-Sheet 3 Tr nnkH.Wc1.icE G E :1 3 EWE mvg] INVENTOR BY @www EL,

dma. ATTORNEY Patented Nov. l, 1927.

UNITED sTATEs FRANK H. WAITE AD GEORGE W. DA'VEY,

Ol' LONG ISLAND CITY, NEW YORK.

FUBNACE CONSTRUCTION.

Application tiled November 27, 1025. Serial No. 71,688.

Our invention relates to furnace wallsiand the circulation of airtherein, wherein there are a pluralit of circulations of. air employedin addition to the air su plied by a lower inthe usual way, one o saidcirculations being through t e front wall directed under the grate ofthe Stoker and another directed into the smoke box or back of the bridgewall.

Our inventionnot only contemplates the combinations of air circulationsby natural or stack draft combined with forced draft,

but a circulation lnduced by an injective action in combination withother circulations directed under the dgrate of a stoker, in addition toai: supplie by a blower in the usual wa I 'lhis is accomplished byutilizing the heat transfer function of our air cooled furnace blocks,specifically illustrated, described and claimed in our applicationbear-in Serial Number 55,752, filed September 11t 1925.

We also utilize the horizontal and vertical expansion means illustrated,described and claimed in our pending ap October 15th, 1925, bearing62630.

One object of our invention is to circulate air in the front wall bystack or natural draft suction in combination with other circulationsthroughout the side walls and a forced draft means.

Another object of our invention is to circulate air in the front wall byan injcctive action of a forced draft means in combina.

erial Number Vtion with other circulations throughout the side walls anda forced draft means.

Other valuable features of our invention and the unique application ofthe circulations are described, pointed out and illustrated in theaccompanying drawings wherein like numerals indicate like parts, and inwhich Figure 1 is a longitudinal section ofa water tube boiler stokerfurnace.

Figure 2 is a partial front elevation of Fi ure 1.

igurc 3 is a longitudinal section of a water tube boiler stoker furnaceillustratingra modification of the invention.

igure 4 is a partial front elevation of Figure 3.

Figure Figure 1.

Figure 6 is a partial plan in section of Figure 3.

5 is a partial plan in section of `driven by the' motor 17 and belt 18is lication filed Figures 1, 2 and 5 illustrate a water tube boilerfurnace consisting of a front wall 1, side walls 2 and 3, bridge wall 4,water tubes 5, a drum 6, an angular balile 7, a vertical baille 8, a gasoutlet 9, a clean out o ening 10, a grate 11 the combustion cham er 12,a stoker mechanism 13, a coal hopper 14, a blower or fan 15 and a windbox 16.

There are four separate and distinct circulations of air throughout thefurnace, il-

Vlustrated in Figures 1, 2 and 5, two of which circulate through thefurnace walls, coolin the interior of the walls or the superimposebroken jointed air cooled blocks that make up the major portion of thefurnace lining; and the air preheated in transit throughout the saidwalls is utilized as a more complete or perfect combustion of thematerials of combustion.

In the third or well known forced draft circulation, the air from theblower 15 force into the wind box 16, passes under the ate 11 throughthe elbow 19, provided with a controlling damper 20, to the combustionchamber 12, through the fuel on the grate 11, thence upwar ly around thetubes 5, drum 6, over bailes 7 downwardly around tubes 5, under baliles8, upwardly around tubes 5, around drum 6, through the gas outlet 9 tothe stack.

In the first circulation illustrated in Fi ures 1, 2 and 5, the air inthe front wa baiiied at 25 and 26, enters the horizontal fines 21 of theblocks 22, provided with vertical flues 23, through lnlets 24, each of`which is provided with a' damper 27, having a slide 28 controlling thevolume of air entering said inlets.

The air in this front wall 1, preheated .in transit in its downwardpassage throughout the blocks 22, flowing in a direction oppositeto theflaming gases in the combustlon chamber 12, is directed upwardly underthe grate 11 by the elbow 29 and there is a suction induced in thiselbow 29 by the forced draft pressure hereinbefore described, whichco-operates with the stack ressure or suction in operating this circuation.

The second aforesaid circulation in reference to Figures 1, 2 and 5 isthe circulation throughout the su erimposed, broken jointed walls 2 and3 bui t up 1n art of air cooled refractory blocks 22, an these walls areprovided with horizontal expansion means 30 and 31 and verticalexpansion means 32 preheated alr for as well as the 33, 34 35 andtively.

horizontal expansion spaces 36 in walls 2 and 3 respec- The air enteringthe horizontal tlues 21 of the wall 2 through .llues or ducts 37, eachprovided with 28 controlling thereto, passes and vertical tlues 21 and23 a damper 27 having a slide the volume of air admitted throughout thehorizontal in the wall 2 1U in a substantially horizontal direction,'llowtransit throughout said ing at right angles to the flow of flaminggases within the combustion chamber 12,

into the expans as a manifold the reheated a manifold 38 by wall 4.

The air circulating ion space 34 which also acts for all the airpreheated in wall, from whence ir is directed into a common the flue 39within the bridge in wall 3 enters the vertical tlues 21 and 23 reugh amultiplicity of ducts 40, each of which is provided with a damper 27,having a slide 28 controlling the volume of air admitted to each of saidducts 40,

passes in a subs at r1ght angles tantially horizontal direction to theflow of flaming gases within the combustion chamber 12, into theexpansion space which acts as a common manifold for said air preheatedin transit throughout said blocks 22, from whence the preheated air i sdirected into the common manifold 38 for both walls 2 and 3 by the ductor Hue 41.

The preheated air thus collected in the manifold 38 common to both walls2 and 3,

is directed to flow back of the bridge wall 4 by ducts 42 and 43 ofequal area in cross section and duct 44 of a. greater area 1n crosssection, from whence it passes upwardly around the tubes 5 and the gasoutlet 9 drum 6 through into the stack.

The second circulation is within the wall 2. passing thro ughout thewall within the 3, passing` thro ughout the wall within the 5u ducts 2land 23 into the common manifold 38 and from thence to the stack ashereinbefore described.

In the fourth circulation the air from the blower 15 is forced into thewind box 16 under the grate 11. directed thereto by the elbow 19 havinga volume controlling damper 20, into the combustion chamber 12 fromwhence it passes upwardly around the tubes 5 and drum 6.

downwardly over baille 7,

o around tubes 5, under baille 8,` upwardly around tubes 5, through gasoutlet 9 into stack.

Thus the air preheated in transit throughout the front w bined induced aof the stack is combustion of the tion chamber 12.

e air preheated in transit throughout each side wall is directed intothe second or third pass behind the bridge wall and is not utilized inthe combustion chamber at all.

In Figures 3, 4 and 6, there are illustrated five dilferent and distinctcirculations of air within a furnace, four of which circulate throughoutthe side and front walls, cooling the interior of the walls or thesuperimposed broken jointed air cooled refractory blocks that make up,in part, the side walls; and the air preheated in transit throughout thesaid walls is utilized for more complete combustion of the fuel withinthe combustion chamber 12.

The fifth circulation is precisely the same as the third hereinbeforedescribed, having similar controlling means and flow.

In the first circulation the air from the blower 15 passes into the windbox 16, under the grate 11, through the elbow 19 provided with a volumecontrolling damper 20 to the duct and into the common manifold 46 ofside wall 3, flowing upwardly in a direction parallel to the llow offlaming gases within the combustion chamber 12, and is directed to llowevenly throughout the wall toward the front wall by the baflles 49, and51 into an expansion space acting as a common manifold 36 from whencethe air tlows in a substantially horizontal direction at right angles tothe flow of flaming gases within ,the combustion chamber 12 throughoutthe horizontal and vertical passages 21 and 23 in the front wall 1, andis directed to How evenly throughout the said wall 1 by the baffles 52and 60 downwardly into a common manifold 54 from whence the airpreheated in transit throughout the said wall of air cooled blocksisdirected into a conduit or llue 55 terminating in a reduced end 56 whichis centrally located within the elbow 19 in parallel relation theretoand to the flow of air under pressure therein froln fuel within thecombus- ,the blower 15;

The air thus preheated is circulated by the injective action of theforced draft from the blower upon thereduced conduit in parallelrelation to the blower elbow or un equivalent and the flow of airtherein.

A portion of this preheated air flows upwardly through the grate 11 intothe comb uston chamber 12 around tubes 5 and drum 6, over baille 7,downwardly around tubes 5 under baille 8, upwardly around tubes 5 anddrum 6 into the gas outlet 9 to the stack.

Another portion of this air enters the duct 45 and circulates throughoutthe walls 3 and 1 as hereinbefore described, continues to circulate inthis cycle and composee the second circulation..

In the third circulation the air from the blower passes into the windbox 16, under` 'the `grate 11, through the elbow 19 provided 'with avolume controlling 'damper 20 into the commonmanifold 48 of the sidewall 2 by the duct 47, flowin upwardly in a d1- rection parallel to theVow of iaming gases within the combustion chamber 12, and .is directed toflow evenlyl1 throughout the wall toward the front wal by the bafiles57, 58 yand 59 into an expansion space actin as a common manifold 33from whence t e air .passages out through the rear of said wall,

flows in a substantially horizontal direction at right angles to the`flow of flaming gases Within the combustion chamber 12 throughout thehorizontal and vertical passages 21 and 23 in the front wall 1, and isdirected to flow evenly throughoutthe said wall 1 by the baliles 53 and60, downwardly into a common manifold 54, from whence the air preheatedin transit throughout the said Walls of air cooled blocks is directedinto a conduit or flue 55, terminating in a reduced end 56 which iscentrally located within the elbow 19 in parallel relation thereto andto the ilow of air under pressure therein from the blower 15.

The air thus preheated is circulated by the `injective action ashereinbefore described in the first circulation and likewise a portionof this air passes throughout the furnace in a like manner and thisconstitutes the third circulation.

TheV fourth circulation is one similar to the second only in wall 2 and1 entering manifold 48 through the duct 47.

In the fifth circulation the air from the blower passes into the windbox 16 under the grate 11 through the elbow 19 having a volumecontrolling damper 20, through the rate 11 and the fuel thereon into thecomustion chamber 12, upwardly and around tubes 5 and drum 6, downwardlyover baf-` fles 7, around tubes 5 under baflies 8, upwardly around tubes5 and drum 6 into gas outlet 9 to stack.

The side Walls are provided with horizontal expansion means and 3l,vertical expansion means 32 and horizontal expansion spaces 33, 34, 35and 36.

Having thus described and illustrated the preferred embodiment of ourinvention we do not (lesite to limit ourselves to the exact subjectmatter pertaining to the s eciic circulations and combination thereo asmodifications may be made without departing from the spirit of theinvention or the scope of the claims.

We claim 1. In a furnace structure, the combination ofrefractory frontand side walls having air passa es therein, a Stoker grate in thefurnace c amber, an outlet for the lproducts of combustion in an upperpart of t e chamber,

a bridge `wall having air passages therein,

baille means directingthe products of combustion from the outlet acrossand back of the bridge wall, ports from the bridge wall air feedingmeans below the grate, air inlet means to the front wall passa es, aircon ducting means leading from sai passages to a point beneath the gratewithin the influence ofthe air from said feeding means, air mlets forthe side wall passages, and a communicating duct between the passages ofeacll side wall and the passages of the bridge wa 2. In a furnacestructure, the combination of refractory walls composed of blocks havinair assages therein, said walls substantia ly efining the combustionchamber, means for admitting fuel to said chamber, an oii'take for theproducts of combustion, air inlets to the passages' of a wall, air portsfrom the passages of another wall into the furnace chamber, and acombined air duct and expansion space for the refractory blocks saidslot duct connecting the passages ofthe wall having inlets to thepassages of the wall having ports into the chamber.

3. The combination with a furnace having refractory front and sideWalls, a grate, means for feeding fuel, air feeder means, and an otakefor the products of combustion ;4 of air assages in the walls, baillemeans in the ront wall dividing said passages nito a plurality ofcirculatory systems, bales in the side walls spaced to distributeuniformly the' air flowing through said walls, air inlet means to saidside wall passages opening under the grate and adapted to receive airfrom the feeder, and air outlet .means from the front wall passagespositioned in the flow of air from the feeder to deliver heated airbeneath the grate.

Signed at Long Island City in the count of Queens and State of New Yorkthis 24th day of November A. D. 1925.

FRANK H. WAITE. GEORGE W. DAVEY.

i -common manifold 33 the 'grate 11,

'and 23 in the front wall- 1,

nemici In the'third circulation'the air from the .blower 15 passes intothe wind box 16, under,v

'with a volume controlling 'damper 20 into the common, manifo1d48`oftheside wall 2 by the duct 47, ilowin upwardly in a d1- rectionparallel tothe, ow of flaming gases within the' combustion, chamber 12, .and .1sdirected to flow 'everlly throughout the wall toward the front w by thebailile's 57, 58 and59 into an expansion space 'actin as a from whenceows in a substantially horizontal direction at right angles to the 'flowof ilaminggases within the co bustion chamber 12 throughout thehorizontal and vertical passages 21 and is 'directed to flow evenlythroughout-the said wall 1 by the baiiies 53 and 6O-downwardlyr into acommon ymanifold 54, from whence the air preheated in transit.throughout the said walls ofair cooled-'blocks is directed into aconduit or flue 55, terminating in a reduced end 56'which is centrallylocated within the elbow 19 in parallel relation thereto and to the flowof airunder pressure therein from the blower 15.- 4

The air thus preheated is circulated by the injective action as theirstl circulation and likewise a portion of this air passes throughoutthe furnace in a like mannerandthis constitutes the third circulation..

The fourth circulation lis one similar -to the second only in wall 2'and 1 entering manifold 48- through the duct'li'?.

In the fifth circulation the air from the blowerpasses nto`the wind box,16 under the grate 11 through the elbow 19 having a volume controllingdamper 20, through the rate 11 and the fuel thereon into the comustionchamber 12, upwardly and around tubes 5 and drum 6, downwardly overbaffles 7, around tubes 5 under baies 8, upwardly around tubes 5 anddrum 6 into gas outlet 9 to stack. i

The side wallsl are provided with horizontal expansion means and 31,vertical Pexpension means 32 and horizontal expansion spaces 33, 34, 35and 36.

Having thus described and illustratedthe preferred embodiment 'of ourinvention we do not desire vto limit ourselves to theiexact subjectmatter pertaining to the s eciic circulations and combination thereo asmodifications may be made without departing through the. elbow 19provided,

. passa nace c amber,

e air .passages o ut through the rear o'f said wall,

hereinbefore described in 1. In a Vfurnace structure, the combinationofrefractory front and side walls having air es therein, ,a stoker gratein'the furau outlet for the lproducts of combustion in an upper part oft e chamber,

,a bridgewall having air lpassages therein,

baemeans directing theproducts of combustion from the outlet across andback of the bridge wall, ports fromthe bridge wall air feeding meansbelow the grate,v air inlet means to the frontwall passa es, airconducting means leading4 from sai passages to a point beneath Y enceofthe air from saidfeeding means, air inlets for 'the side wallpassages, and a communicating 'duct between the passages of eacll sidewall and the passages of the bridge wa l 2. In a furnace structure, thecombination of refractory walls composed of blocks having air assagestherein, said walls substantially efining the combustion chamber, meansfor admittingdfuel to said chamber, an oitake for the pro ucts ofcombustion, air inlets to the passages' of a wall, air ports 4from thepassages of another -wall into the means inthe ront wall dividing saidpassages ii'ito a plurality of circulatory systems, badles 1n the sidewalls spaced to distribute un1formly the' airy flowing through saidwalls, air inlet means to said 'side wall passages opening u'nderthegrate and adapted to receive air 'from' the feeder, and air outlet:means from the front wall passages positioned 1n the iiow of air fromthe feeder to deliver heated air beneath thegrate.

Signed at Long Island City in the count `of Queens and State of New Yorkthis 24h 4day of November A. D. 1925.

' FRANK H. WAITE..

GEORGE W. DAVEY.

Certillcate of Correction.

Patent N o. 1,647,161.

Granted November 1, 1927, to

FRANK H. WAITE ET AL.

lt is hereby certified that error` appears in the numbered patentrequiring correction as follows:

said Letters Patent should bere-ad with this co1'- {Iirntedspecification of the abovea e 3, line 89, claim 2, strike out rectiontherein that the'same vmay conform to the record of the case in thePatent Oiiice.

Signed and sealed this 6th l'snAnl day of December, A. D. 1927.

M. J. MOORE,

i from the spirit4 of the invention or the scope of the claims.4 Weclaim the grate within'ithe inilu- Certicate of Correction.

Patent No. 1,647,161. Granted November l, 1927, to FRANK H. VVAITE ETAL.

It, is hereby certified that error appears in the grim-ed specificationof the abovenumbered patent requiring correction as follows: age 3, line89, claim 2, strike out the wurd slot"; and that the said Letters Patentshould be read with this correction therein that thesame may conform tothe record of the case in the Patent Office.

Signed and sealed this 6th day of December, A. D. 1927.

[smh] M. J. MOORE,

Acting Commissioner of Patents.

